Control system



R. C. CARLSON CONTROL SYSTEM Jan. 29,

7 Sheets-Sheet 1 Filed June 15, 1959 INVENTOR. .Reuben 6. Gar/s0 R. C. CARLSON CONTRO);I SYSTEM Jan. 29, 1963 '7 Sheets-Shet 2 Filed June 15, 1959 INVENTOR. By Reuben 6'. Car/son -I'llllllllllllnll 'Illlllll llllllllllllllllllllllll IIL Jan. 29, 1963 R. c. cARLsN 3,075,400

CONTROL SYSTEM Filed June 15, 1959 '7 Sheets-Sheet 4 /22 8 [22a Z3 23a /27 256 52235 L@ 32 m55 /255 234/ U V235 /2 /25 /20 236 25,9 /23a /23 /22a 35 /w /r nw/25 40 /zab /254 c W26@ INVENTOR. Reuben 6.' Caf/son BY Jan. 29, 1963 R. c. cARLsoN CONTROL SYSTEM 7 Sheets-Sheet 5 www.,

Filed June 15, 1959 Q Sk .WAM

INVENTOR Reuben Y Caf/son R. C. CARLSON CONTROL SYSTEM Jan. 29, 1963 7 Sheets-Shea?I 6 Filed June 15, 1959 QQ g@ bmw INVENTOR. Reu/Jen 6.' Car/son www Awww

Jan. 29, 1963 R. c. CARLSON CONTROL SYSTEM Filed June 15, 1959 Sul 5% from a transmitter.

United States Patent C) "F 3,075,409 CONTRL SiitlEF/i Reuben C. Carison, Benseuyiiie, lil., assigner to Admiral Corporation, Chicago, itil., a'corporation of Delaware Filed Iiune', i959, Ser. No. 820,@66

6 Claims.' (Ci. '7d-472) The present invention relates to control systems for controlling the operation of electrical circuit means and, more particularly, relates to a new and improved control system operable by energy signals radiated from a remotely positioned transmitter means.

The new and improved control system has particular utility in remotely controlling selected ones of the control functions oi a wave signal or the like receiver. Although the invention is described in connection with a wave signal receiver, it should not be construed as being limited or restricted to this luse since the invention has a wide variety of applications in other types of electrical apparatus.

it is an object of the present invention to provide a ew and improved control system for controlling an electrical circuit means.

it is still another object of the present invention to provide a new and improved control system wherein the operative condition of a selected control function is incrementally adjustable in either a ,iirst or a second predetermined manner.

it is a further object of the present invention to provide a new and improved control rsystem in which the operative condition oi a selected control function is continuously adjustable in either a lirst or a second predetermined manner.

.it is a further object of the present ,invention to provide a new and improved remote control system wherein one .oi a plurality of control functions in an electrical circuit is conditioned to be remotely controlled and then the selected control function is remotely controlled to change its operative condition.

it is another object of the present invention to provide a new and improved remote control system embodying suitable driving means operative in response to the vtransmission oi energy signals to control the speed and direction of rotation of electrical elements associated with control functions in an electrical circuit means.

lt is yet another object of the present invention to provide in a new and improved remote control system a prime mover means adapted to be drivingly coupled to eiectrical elements in an electrical circuit means to increase or decrease the operative condition of selected ones or" the control functions of the electrical circuit means.

It is a further object of the present invention to provide a new and improved remote control system wherein energy signalsare transmitted to render portions of a gearing mechanism effective and to effect a driving connection between electrical elements in an electrical circuit means and a prime motor means adapted to produce predetermined movement of the electrical elements.

it ,is still anotner object vot the present invention to provide in a remote control system Va new and improved gearing mechanism for selectively rotating in pre-determined directions one of a plurality of control shafts.

itis a further obiect of rthe present invention to provide in a remote control Isystem anew and improved gearing mechanism embodying first and second gear trains adapt- Aed to be rendered ciiective and driven by a prime mover for the purpose oi controlling the speed and direction oi rotation of a plurality of control shafts.

'Ihe above and other objects are realized inv accordance with the present invention by providing an electrical circuit means with a new and improved remote control system adapted to be actuatedby energysignals radiated The transmitter is of the mobile or 'i'd@ Patented `ian. 29, 1963 portable type and is manually operable to produce a plurality of distinguishable energy signals. In one aspect of the present invention, the control system is responsive to energy signals radiated by the transmitter to change, either incrementally or continuously, the operative condition of a selective control function of the electric circuit means in either a iirst on a second predetermined manner. Since the remote control system has particular application with a specic electrical circuit means, i.e., a wave signal receiver such as a tele ision receiver, the following pairs of control functions, for example, can be remotely controlled: channel selection and volume, channel selection and iine tuning, channel selection and brightness, channel selection and contrast, volume and line tuning, brightness and contrast, et cetera.

in another aspect of the present invention, the control system operates in response to energy signals radiated by the transmitter to drivinglyconnect a prime mover to selected ones of the electrical elements in an electrical circuit means for the purpose of increasing or decreasing the operative condition of selected ones oi the control functions of the circuit means. In a rst arrangement, the control system in response to a rst energy signal radiated from the transmitter conditions a selected one of the control vfunctions to be remotely controlled, and thereafter its operative condition is either increased or decreased by successively radiating second or third energy signals. To this end, in response to an energy signal one of a plurality of gear trains is rendered eiiective and the effective gear train and a prime mover, operable under the control of other energy signals, are drivingly coupled to rotate the electrical elements in a particular one of two directions. in a second arrangement, the control system is responsive to any one of four energy signals radiated from the transmitter to directly increase or decrease the operative condition of a selected one of the control functions. in this connection in response to one of four energy signals, one of the gear trains is rendered eiective and simultaneously the prime mover is so energized as to rotate one of the electrical elements in a particular one of two directions. ln either of the above two arrangements, the operative condition of the control function, except in the case of the channel selection function, associated with the driven electrical element is incrementally increased or decreased, the size of the increment being determined by the eiective duration of the radiated signal. In yet another aspect of the present invention, the control system is operative to provide controlled increments of adjustment of magnitudes determined by the interval between successive signal radiations independent of signal duration for a control function other than the channel selection function. Brieiiy, a driving connection between the prime mover and one of the electrical elements is effected in response to the transmission of an energy signal to initiate the change in the operative condition of the control function. The operative condition is continuously increased or decreased under the control of the prime mover means, and, when a desired operative condition is obtained, the driving connection between the prime mover and one of the electrical elements is broken in response to the transmission oi the same energy signal. Accordingly, the continuous change in the operative condition of the selected control function is terminated at its desiredlevel within the exclusive control of the operator of the transmitter.

in still a further aspect of the present invention, there is provided a new and improved gearing mechanism having a plurality of gear trains adapted to be selectively rendered effective by a rocker assembly. When rendered effective, the gear trains establish a driving connection -between a prime mover means and different control shafts.

The direction of rotation of the prime mover means is controllable so that a selected rotation of any one of the control shafts may be obtained.

The invention, both as to its organiation and method of operation, taken with further obiects and advantages thereof, will best be understood by reference to the following description taken in connection with the accompanying drawings, in which:

FlG. l is a diagrammatic view of first and third embodiments of the remote control system embodying the principles of the present invention; t

HG. 2 is a schematic view of the first embodiment of the remote control system of FIG. l;

FlG. 3 is a front elevational view of a portion of the embodiment shown in FlG. 2;

FIG. l is a top plan view of the structure shown in FlG. 3;

FlG. 5 is a sectional view taken along line 5 5 of FlG. 3, illustrating a rocker assembly as it renders effective one of the gear trains of a gearing mechanism;

FlG. 6 is a fragmentary sectional view taken along line 5 5 of PEG. 3, illustrating a motor means in driving engagement with the effective gear train shown in FlG. 5;

FlG. 7 is a fragmentary sectional view taken along line 5'-5 of FIG. 3, illustrating the rocker assembly as it renders effective another gear train of the gearing mechanisrn;

PlG. 8 is a fragmentary sectional view taken along line 5 5' of HG. 3, illustrating the motor means in driving engagement with the effective gear train shown in FIG. 7;

FlG. 9 is a diagrammatic view of second and fourth embodiments of the present invention;

FlG. l0 is a schematic view of the second embodiment of the remote control system of FIG. 9;

lilG. ll is a schematic View of the third embodiment of the present invention; and

FIG. l2 is a schematic View of the fourth embodiment of the remote control system of PEG. ll.

Referring now to the drawings, a first and a third cmbodiment of 4a remote control system embodying the principles of the present invention are illustrated diagrammatically in FlG. l and schematically in FIGS. 2 and l1, respectively, while a second and fourth embodiment of a remote control system embodying the principles of the present invention are illustrated diagrammatically in PIG. 9 and schematically in FIGS. 1G and l2, respectively. To facilitate identification of the different embodiments of the remote control system, the embodiment shown in FIG. 2 is referred to hereinafter as the FIG. 2, three-buttonincremental adjustment system, the embodiment shown in FIG. ll) is referred to hereafter as the FlG. l0, fourbutton-incremental adjustment system, the embodiment shown in FlG. ll is referred to hereafter as the three button-continuous adjustment system, and the embodiment shown in FlG. l2, as the FlG. l2, four-button-continuous adjustment system. Each of the remote control systems is used to control the operation of an electrical circuit means, for example, a wave signal receiver and particularly a television receiver, and comprises a portable transmitter adapted to generate energy signals, hereinafter called ultra-sonic signals, and further comprises a control system operable in response to the transmitted ultra-sonic signals to control the operative condition of one of a plurality of control functions of the television receiver. For illustrative purposes, two control functions of the television receiver are controlled by the above-referred to remote control systems, one of the control functions being channel selection and the other being volume. lt should be understood that more than two control functions can be controlled by the system of the present invention and, further, that control functions other than channel selection and volume can be remotely controlled by the system of the present invention.

Considering now briefly the FIG. 2, three-button-iucremental adjustment embodiment, a conventional television receiver Ztll is illustrated in block form as an example of the type of electrical circuit means that can be controlled by a remote control system 22. comprising a control system 23 actuable by a remotely positioned transmitter 2d. As is well known, the television receiver has many control functions, for example, ori-olf, volume, fine tuning, brightness, contrast, and channel selection. The television receiver circuit includes a plurality of adjustable electrical elements which are manually controllable to adjust the control functions of the television receiver fill. Particularly, insofar as the volume and channel selection control functions are concerned, the electrical elements involved are a resistive potentiometer including a rotatable shaft and a main tuning shaft, respectively.

In FIG. l, the transmitter 24, per se, is a conventional acoustical transmitter which is manually operable to develop three distinguishable energy signals of predetermined magnitude and frequency. The ultra-sonic signals are separately radiated from the transmitter 2d for detection by the control system 23 which is located preferably adjacent to the television receiver 2h. ln fact, the control system 2? is ideally supported from the chassis of the television receiver Ztl so that it is enclosed within the television cabinet out of view of an observer of the receiver 2li.

Briey, the control system comprises an input circuit including a microphone 26 for converting the ultra-sonic signals into electric signals having frequencies respectively corresponding to the frequencies of the ultra-sonic signals. The electrical signals are coupled to a three frequency selective ampliter network 2d including an amplier circuit and a discriminator circuit. ln response to the transmission of a first ultra-sonic signal, the discriminator circuit causes a conductor 7,7 to be energized to effect the operation of a channel-volume selector relay 3l). The selector relay Sil controls a selector 7:2 which comprises a gearing mechanism including separate gear trains adapted to be rendered effective by a rocker assembly to prepare `a driving connection between a prime mover 38 and either the volume potentiometer shaft or the main tuning shaft associated with the volume and channel selection control functions of the television receiver Ztl. Actually, the selector 32 alternately is actuu ated in response to successively radiated, first ultra-sonicV signals to cause the `gear trains associated with the potentiometer shaft and the main timing shaft, respectively, to be alternately rendered effective for subsequent driving engagement with the prime mover Se. The prime mover 3d is selectively energized by a channel-volume up relay dit and a channel-volume down relay d2 to cause the prime mover 3d to move in such a direction that a desired rotation in the potentiometer shaft and the main tuning shaft is effected. Consequently the sound level of the receiver and the channel to which the receiver is tuned are changed in a desired manner. After a control function of the television receiver 2t) is selected to be remotely controlled, for example the volume control, the

'transmitter 2d is manually operated to radiate a second ultra-sonic signal which is detected and converted by the microphone 2.o into a second electrical signal. The second electrical signal is fed to the amplifier network 2li wherein the discriminator circuit causes a conductor y29 to be energized to effect the operation of the channelvolume up relay dll, with the result that the prime mover 3S is energized to drive the effective gear train in the: selector 32 in a predetermined direction to so actuate the volume potentiometer shaft that the sound level of the receiver il is incrementally increased to a higher level. The sound level of the receiver Ztl is further crementally increased to a yet higher level by the suc-- cessive transmission of thersecond ultra-sonic signals. On the other hand, if it is desired to decrease the sound level of the receiver when the volume control function is selected by the selector 32, the transmitter 2d is operated to radiate a third ultra-sonic signal which. is detected and converted by the microphone 26 into a third electrical signal. This third electrical signal is fed to the amplitier network 28 wherein the discriminator circuit causes a conductor Till `to be energized to effect the operation of the channel-volume down relay ft2. The operation of the relay 42 causes the prime mover 3S to drive the effective gear `train of the selector 32 in the opposite direction to that obtained above and the volume potentiometer shaft is adjusted so that the sound level of the television receiver Ztl is incrementally decreased. The sound level of the receiver Ztl is further incrementally decreased by the successive transmission of the third ultra-sonic signals. The channel selection control function is remotely controlled by transmitting a first ultrasonic signal to cause the selector 32 to render eifective the gear train associated with the main tuning shaft. Thereafter, either the second or third ultra-sonic signals are successively transmitted to tune the receiver Ztl to the desired channel.

Considering now in greater detail the television receiver 2t) controlled iby the remote control system 22 and referring now to FIG. 2, it includes an antenna 42 coupled to a receiving circuit -lli which comprises the usual radio-frequency vamplifier section, station selector section including the above-referred to main tuning shaft 4S and a line tuning arrangement, iirst detector section, interediate frequency-amplifier section, and second detector section. As shown, the output of the receiving circuit 44, i.e., the output of the second detector section, is coupled to a video arnplier de, an audio circuit t8 including volume potentiometer having a shaft 439, and a sweep system circuit Sil. The output of the video ampliiier circuit Ltd is coupled to an electronic gun embodied in a cathode ray tube 52, while the output of the sweep system circuit 59 is coupled to a deflection yoke of the cathode ray tube 52, illustrated schematically by coils S4. The output of the audio circuit i8 is coupled directly to a conventional loudspeaker 56, the sound level of which is controlled by adjustment of the potentiometer shaft 49. Since the construction and operation of Ithe television receiver 2d is well known and comprises no part of the present invention, a description of its operation is not included herein.

The construction and operation of the FIG. 2, threebutton-incremental change remote control system will now be described in detail. The transmitter 2d, as suggested above, is of the acoustic resonator type and comprises three resonator rods individually identified as a selector rod 7d, au up rod 7l, and a down rod 72, which are supported from a casing 74 of the transmitter 24. Each of the resonator rods 7d, 7l, and 72 is adapted to be shock-excited by a suitable manually-operable hammer, or the like (not shown), to produce an ultra-sonic signal having a frequency corresponding to the length and/or configuration of the rod. ln a transmitter 24 used with a control system constructed in accordance with the principles of the present invention, the frequency of the ultra-sonic signal radiated by the resonator rod 7l) is 38.285 kc., the frequency of the ultra-sonic signal radiated by the resonator rod 7l is 39.285 kc., while the frequency of the ultra-sonic signal radiated by the resonator rod 72 is 40.805 kc. None of these ultra-sonic signals, hereinafter referred to individually as the tirst, second and third ultra-sonic signals, has a constant ainplitude but each has an amplitude that exponentially decreases as time progresses. As previously suggested, the selector resonator rod 70 causes the control system Z2 to condition either the channel selection control function or the volume control function to be remotely controlled. More particularly, repeated striking of the selector resonator rod 7@ alternately conditions the channel selection and the volume control functions to be remotely controlled by either the up resonator rod or the down resonator rod 72. The second ultra-sonic signal radiated by the up resonator rod 7l causes the control system 13 t0 bodied in the gearing incrementally increase the operating condition of the selected control function and, in response to repeated striking of the rod 7l, a desired operating condition for the selected control function is obtained. On the other hand, the third ultra-sonic signal radiated by the down resonator rod 72 causes the control system 23 to incrementally decrease the operating condition of the selected control function and, similarly, in response to repeated striking of the rod 72, a desired operating condition for the selector control function is obtained.

Each of the ultra-sonic signals radiated by the resonator rods 7i?, 7l, and 7?. is detected by the microphone 26 embodied in the input circuit of the control system 2.3. The mechanical energy of the ultra-sonic signals are respectively converted into electrical signals having the same frequencies as the ultra-sonic signals, i.e., 38.285 kc. 39.285 kc., and 40.805 kc. These A.C. electrical signals are coupled to the three-frequency selective arnplifier network 28 and, particularly to an amplifier 7d which amplies the signals developed by the microphone 26. The amplified electrical signals are fed into a discriminator 7a? which causes: a DC. pulse to be supplied to conductor 27 in response to the rst electrical signal, a DC. pulse to be supplied to the conductor 29 in response to the second electrical signal, a D C. pulse to be supplied to the conductor 3l in response to the third elecrical signal. The conductors 27, 29 and 3l are respectively connected to the grids of negatively-biased, con trol tubes 79, 8l? and 8l which are rendered conductive by the application of the DC. pulse to their respective grids. As shown, the plate circuits of the tubes 7%, tid and 3l include control windings Stia, 40a, and 42a of the chainiel-volume selector relay Sil, channel-volume up relay dit, and the channel-volume down relay 42, respectively. l-ience, in response to the transmission of any one of the three ultra-sonic signals, the associated one of the tubes 79, 3f: or til is rendered conductive so that current ows through the associated windings 3de, 49a, or 42a to operate the corresponding relay 3d, d@ or 42.

The operation of the selector relay 3@ in response to the rst ultra-sonic signal causes the selector 32 to be actuated. The selector 32 comprises both a rocker assembly including a rocker 36 and a gearing mechanism dit mechanically associated with the rocker d6. in rcsponse to successively radiated, first ultra-sonic signals, the rocker 86 alternately moves into its two operative positions under the control of the selector relay Sti to render alternately effective gear trains 9i) and 94 emmechanism tid. in a tirst operative position, the rocker 86 renders effective the gear train Sill, ie., conditions the gear train t) to be subsequently driven by the prime mover 38 comprising a bidirectional, AC. electric motor. The gear train 9d drivingly engages a control `shaft 92 which is mechanically connected, as indicated by dotted line 93, to the volume resistive potentiometer 49 located in the audio circuit d8 of the television receiver ln its second operative position, the rocker 8d renders effective the gear train 94, i.e., conditions the gear train 94 to be subsequently driven by the electric motor 3S. The gear train se drivingly engages a control shaft E6 which is mechanically connected, as indicated by dotted lines 97, to the main tuning shaft 4d of the receiver circuit i4 of the television receiver 526.

A driving connection between the motor 3S and either the volume potentiometer shaft i9 or the main tuning shaft 45 is effected by the energization of the motor 38 under the control of the up relay 4t) or the down relay d2 operated in response to the transmission of either the second or third ultra-sonic signal. The energized motor 3S drivingly engages either the gear train 9d or 94 rendered eliective by the rocker assembly 85 to rotate either the control shafts 92 or gri. The relays itl and 4?. so energize the motor 38 that the output shaft 33a of the motor 3% rotates in a clockwise or counterclockaora-teo wise direction, with the result that the potentiometer shaft 429 or main tuning shaft l5 associated with the control shafts 92 and 95 is rotated to either increase or decrease the operative condition of its associated control function, i.e., either to increase or decrease the sound level of the television receiver 2@ or to tune the television receiver to a higher or a lower channel.

Assuming that the channel selection control function is conditioned to be remotely controlled and it is desired to adjust the volume of the television receiver 2li, the transmitter 24 is operated to cause the selector resonator rod 7@ to radiate a iirst ultra-sonic signal. rthis signal is converted by the microphone 2d into an electrical signal which is fed to the amplifier 7d and then the discriminator 78. This iirst electrical signal causes a DE. pulse to be applied to the conductor 27, thereby to render the control tube itl conductive to complete an energizing circuit for the relay 3d, as follows: ground, tube '79, conductor d2, winding fille, and B-plus. The operation of the relay Si@ causes the armature lilik to be moved downwardly, as viewed in PlG. 2, to actuate the rocker assembly d5. The rocker assembly tid includes an arm lili rotatably supported from the armature ltltl and provided with an angulated linger luid which coacts with an inverted `r-slot structure delined in the upper edge of the rocker 86. The rocker 36 is pivotally mounted on a suitably supported pivot pin S57 and includes an overcenter spring arrangement litio which, in cooperation with the angulated linger 162e, causes the rocker 36 to be moved between its two operative positions, one of which is illustrated in FIG. 2 and the other of which is not shown but is a mirror image ot the illustrated position oi FG. 2. Although not shown, when the rocker Se is in the latter position prior to Operation of the relay 3u, the angulated linger w25'. is located above the rocker Se and specifically is vertically above a leg portion lltlfla and the upper end of an armv portion lltllb of the slot structure ldd.

rthus, in response to the first ultra-sonic signal, the downward movement of the armature Mil` of the relay dll causes the angulated linger luga. of the supported arm lilZ to move downwardly through the leg portion ludo ot the slot structure into the arm portion lid-tb. The arm portion lltldb, being directly beneath the linger 162g, intercepts and guides the linger ltlZa into engagement with its end Ill (see EEG. 2), whereby the rocker 86 is moved from its operative position inclined downwardly to the right (not shown) into its operative position inclined downwardly to the left, shown in FlG. 2. Actually, the angulated linger ltl'Za of the arm lith?. exclusively moves the rocker Se out of its operative position (not shown) and, when the rocker @d moves substantially over center, the over-center spring mechanism lilo coacts with the angulated linger lutto to move the rocher Se into its position shown in FlG. 2. The spring mechanism 1% also functions to resiliently bias and maintain the rocker 8o in its operative position. The angulated finger idilio remains in engagement with the end lll of the arm portion ltldb during transmission of the first ultra-sonic signal and, when at the end of the transmission of the first ultra-sonic signal the relay SilV is deenergized, the angulated linger lilZn moves upwardly in the arm portion liiib and 4the leg portion lll-ta under the control of the armature ltitf into its position above the rocker do. The upwardly moving linger lltlZa does not actuate the rocker Sie since the arm luz is rotatably supported from the armature litltl and the Spring mechanism itin restrains the rocker 26 against any slight movement that might be produced by the upwardly moving linger 1Mo.

Y it will be appreciated that with the rocher @ti in the position illustrated in FIG. 2, an arm portion ltlic of the slot structure litt is moved directly beneath the angulated linger lltlaso that, incident to a successive operation ot the relay 3u, the angulated linger m2o is directed into the arm. portion little and hence, into engagement with the end lil? of the portion lille-c, thereby to move the rocker @d from the position shown in FIG. 2 to its other operative position (not shown).

The rocker assembly 55 controls the operation of the gearing mechanism and, in this connection, the rocker Se is mechanically connected to the gear trains @il and @fr by spindle and disc arrangements. As clearly shown in FiG. 2, the vertical edges of the rocker Se are slotted to produce openings il@ and M2 having neck portions .adjacent the edges of the rocker titi. The openings lll@ and di, respectively, accommodate discs llf and lll@ which are Xedly mounted on vertically movable spindles lid and litil, respectively. These spindles lill and l2@ are journaled in suitable supporting means to permit rotation and axial movement thereof. As shown, the low ends of the spindles lill and Mtl are bredly secured to vertically movable input gears l2?. and 12.3 of the gear trains 9u and 9d. Accordingly, since the gears 122 and are rotated when the gear trains @il and 91dare driven by the motor 38, the discs lid and llo likewise rotate in the openings lll-tl and lli, and, in this connection, the neck portions ol the openings lill and M2 provide bearing surfaces for the rotating discs lid and lle. in addition, the neck portions coact with the rotating discs llld .and liti, respectively, to move the spindles llli and lill upwardly and downwardly, respectively, incident to movement ot the rocher do by the selector relay Till.

rl`he input gears M2 and 123 are alternately moved into their downward positions under the control ot the rocker '96 with the result that their associated gear trains @il and 9d are alternately rendered etlective; conversely, the input gears 123 and 122 are alternately moved into their upward positions under the control ot the rocker 86 whereby their associated gear trains 94 and fdl are rendered ineective. lvlore specifically, prior to transmission or" the above-reterred-to tirst ultra-sonic signal, the rocker 86 is in its operative position (not shown) and the input gear i213 is in its downward position to be drivingly engaged by the axially movable pinion gear 59 incident to subsequent energization of the motor Sil. Accordingly, the gear train @d is rendered ellestive, a driving connection between the input gear M3 Iand the control shaft Elo being at all times established, irrespective of the e'ectlve or ineffective condition et the gear train 9d, as follows: a spur gear lZSa, a pinion gear 3123i?, a spur gear lZSa, a pinion gear lZSb, a Spur gear 29.27 and the control shaft so. it will be understood that the location oi the input gear 123 under the control of the rocker 36 (through the disc ills and spindle Miti) determines the elective and ineffective condition ot the gear train and, thus, whether or not the gear train 94 is subsequently drivingly engaged by the pinion gear 39 as a result of the energization of the motor Titi.

Returning now to the movement of the rocker do from its operative position (not shown) to its 2 position caused by the transmission of the first ultra-sonic signal and the operation of the selector relay 30, the gear train 94 is rendered inelective by the upward displacement of the input gear i293, the input gear 123 being moved into a position out oi driving engagement with the axially movable pinion gear 39 of the subsequently energized motor 38. The movement of the rocker do also renders the gear train @il eiective by displacing the input gear 122 downwardly into a position to be drivingly engaged by the axially movable pinion gear 39 oi the subsequently energized motor 3b, a driving'connection between the input gear llZZ and the control shalt 92 being at all times established, irrespective of the effective or inetlective condition of the gear train gli, as follows: a spur gear llZZa, a pinion gear 122i), spur gear l'Zda, pinion gear llZd-b, spur gear lZo, and the control shaft 92. it should be observed that at this time the effective gear train *')il is neither driven by the motor iid, nor is it in driving engagement with the pinion gear 39 of the motor 3%. h/lfelel':4 a driving COlrleCtGn between the motor 3?; and

f 9 the potentiometer shaft 49 is obtained only after the motos 38 is energized under the control of the up relay lil or the down relay d2 and, thus, the gears i122, ld and 26, and the control shaft 92 are rotated only after driving engagement is eiiected between the axially movable pinion gear 39 and the input gear 122.

ln order to identify the control function of the receiver 2li that is conditioned to be remotely operated, an indicating means 13o is located preferably in the front of the television receiver- 2l?. To this end, the indicating means 13d comprises a generally translucent plate lSZ seated over a recessed portion provided in the iront oi the cabinet of the receiver 2o', the plate 132 being divided into separate windows lSZa and 32h which are respectively marked channel selection and volume control. The windows lSZtz and i325 are alternately illuminated by lamps fidati and lob suitably supported from the recessed portion of the cabinet, which lamps 136e and 13o!) are controlled by a position-sensitive switch 134 actuable by the rocker Se.

Specifically, as the rocker do moves from its operative position (not shown) to its FIG. 2 position in response to operation of the selector relay 3d by the iirst ultrasonic signal, the channel-selection window 132e is darkened and the volume control window 132th is illuminated. More particularly, an energizing circuit for the bulb i3d@ is opened by the opening of the contacts i345 and an energizing circuit for the bulb lob is completed by closure of contacts Edda, as follows: a Six-volt, AC. source, preferably supplied by 'the power source of the television receiver 2li, a conductor i3d, the bulb idol), a conductor ist), switch contacts 13de, and a conductor iid-2 connected to the six-volt source. lt will be understood that as the selector relay :it is successively operated in response to repetitively transmitted, iirst ultrasonic signals, the rocker @ti is alternately moved between its operative positions so that the volume control window 13211 and the channel-selection window lSZrz are alternately illuminated. Thus, irrespective of the condition of the remote control system, the operator of the transmitter 2d is at all times informed or the control function that is conditioned to be remotely operated.

With the volume control function selected, the operative condition of the volume control, i.e., the sound level of the television receiver 2o, can be either ncreased or decreased at the will of the operator of the transmitter 24. lf it is desired to increase the sound level of the receiver Ztl, the transmitter Zd is operated to cause the up reso-nator rod '7l to 'radiate a second ultra-Sonic signal. This signal is converted by the Inircrophone'Zo into a-second electrical signal which is supplied to the amplifier 7e and then into the dscriminator '78. The disoriminator 7d in response to thesecond electrical signal supplies a DC. pulse to the conducto-r 29 and, hence, the grid of the control tube 3b. Accordingly, the negatively-biased tube is rendered conductive to complete an energizing circuit for the up relay dit, as follows: ground, tube 8d, conductor 83, relay winding dan, and B-plus.

incident to operation or" the up relay liti, an energizing circuit for a control winding 162 of the electrical motor Sis completed, as follows: ground, conductor M6, contacts laid, conductor lii, contacts i545 controlled by a position limit cam lil mounted on the control shaft 92, conductor 15o, conductor 157, contacts i553 controlled by a friction cam 159 mounted on the motor driving shaft 38o, conductor Lio-tl, motor control winding loZ, conductor an A C. electrical source loo, and ground. The energizatioo of the control winding 162 under the control of the relay itl etects the rotation of the motor driving shaft 3dr.' in a clockwise direction, as viewed in FlG. 2, whereas the energization of a second control winding lo@ under the control of the down relay 42, as described below, effects the rotation of the motor driving shaft 33a in a counter-clockwise direction as viewed in FlG. 2. In addition to the motor driving shaft 33a rotating in a clockwise direction, as a result of the control winding E62 being energized, the shaft 53a moves axially upward so that the pinion gear 39 moves into an operative position in driving engagement with the gear 122 of the gear train Accordingly, a driving connection is obtained between the motor 3d and the gear train 9i? with the result that the volume potentiometer shaft d@ is driven by the motor 33 and the sound level of the receiver 20 is increased. Particularly, with clockwise rotation of the pinion gear 39, the control shaft 9.2 rotates in a countercloclzwise direction, as seen in FIG. 2, and, assuming that the mechanical connection 35 to the potentiometer shaft 39 provides a direct driving connection, the potentiometer shaft i9 can be considered as also rotating in a counterclockwise direction, as shown in PEG'. 2. This rotation of the volume potentiometer shaft i9 causes the movable wiper of the volume potentiometer to move toward the upper end of its range, thereby to increase the output of the audio circuit 43 and the volume of the loudspeaker Se.

The sound level or the receiver Ztl is incrementally increased by the operation of the up relay in response to the transmission of the second ultrasonic signal. In this connection, the motor 3d is energized only during the duration of the transmission of the second ultra-sonic signal, since the discriminator 78 supplies a DC. pulse to the grid of the normally non-conductive tube di?, only as long as the second ultrasonic signal is being transmitted. Consequently, at the end of the duration of the second ultra-Sonic signal, the discriminator 78 no longer supplies the DC. pulse to the conductor 2?, with the result that the negatively-biased tube dit becomes nonconductive and the relay dit becomes deenergized. Incident to deenergization of the relay dit, the contacts 148 are opened to open the energizing circuit for the motor control Winding M2. The deenergized motor 38 causes the motor driving shaft 33a and its pinion gear 39 to move axially downward, as viewed in FIG. 2, out of driving engagement with the input gear i212 of the gear train 9d so that the driving connection between the motor 33 and the gear train @il is broken and the movement of the volume potentiometer shaft L39 is arrested.

ln the event that the sound level of the receiver Ztl remains too loW even as a result of the above-described change, the transmitter 2d is repeatedly operated to transmit successive, second ultra-sonic signals until the desired sound level is obtained. Specifically, the successively radiated, second ultra-sonic signals repeatedly operate the relay dit which causes the successive energization of the motor control winding loi for intervals of time equal to the duration of the signals, whereby the potentiometer shaft 49 is successively rotated into discrete, equally displaced angular positions to incrementally increase the output of the audio circuit 48 and hence the-volume of the loudspeaker 56.

On the other hand, ii it is desired to decrease the sound level or" the receiver Zit, the transrni ter 24 is operated to cause the down resonator rod '72 to radiate a thirdultra-sonic signal. The third ultra-sonic signal, as described above, causes the discriminator i3 to supply a DC. pulse -to the conductor 3l and hence the grid of the normally negative-biased, control tube 3l. rl`he control tube 81 is rendered conductive to complete an energizing circuit for the down relay 42, as follows: ground, control tube til, conductor 84, relay winding 42a, and B- plus. The relay d2 operates to close a pair of contacts 1ltl which completes an energizing circuit for the control Winding 168 of the motor 3S, as follows: ground, conductor lZ, contacts 17o, conductor 174, contacts 176 controlled by a position limit cam 1&2 mounted on the control shaft 92, conductor 178, conductor 18d, contacts lSZ controlled by the friction cam 59 mounted on the motor shaft 33a, conductor ld, the control winding 16S, the conductor lod, the AC. source leo, and ground. The

energization of the control winding lf3 causes the motordrvie shaft 33a simultaneously to rotate in a counterclockwise direction and to move axially upward so that its pinion gear 39* drivingly engages the gear M2 of the gear train 9i?. Thus, a driving connection is effected between the motor 3d and the potentiometer shaft d@ whereby the shaft is driven by the motor Sil, and the sound level of the receiver Ztl is decreased. Particularly, with the counterclockwise rotation o' the pinion gear 59, the control shaft 92 and, thus, the potentiometer shaft 49 rotate in a clockwise direction. This rotation ofthe shalt causes the movable wiper of the volume potentiometer to move toward the lower end of its range, thereby to increase the output or' the audio circuit d3 andthe volume of the loudspeaker 56.

Similar to the above-described operation, the Sound level of the receiver Ztl is incrementally decreased by the operation of the down relay 42 in response to the transmission of the third ultra-sonic signal. Specically, the motor control winding i655 remains energized only as long as the relay l2 is operative, the relay 42 being operative only during the duration of the third ultra-sonic signal. At the end of the duration of the third ultra-sonic signal, the DC. pulse is removed from the conductor 31, with the result that the control tube til. becomes nonconductive to open the energizing circuit for the relay ft2. r[he deenergization ot the relay 42 causes the contacts ll'd to open with the result that the energizing circuit tor the motor control winding ldd is opened and the motor driving shaft 38a is moved axially downward out of engagement with the gear train 9i?. Accordingly, the driving connection between the motor 3f and the potentiometer shaft i9 is broken and the movement of the potentiometer shaft i9 is stopped.

In the event that the sound level of the receiver is not low enough as a result of the above-described change, the transmitter 2d is repeatedly operated to transmit successive, third ultra-Sonic signals which successively operate the relay l2 and effect the successive energization of the motor control winding lo?) for predetermined time intervals corresponding to the time duration of the third ultra-sonic signals. Consequently, the potentiometer shaft i9 is successively rotative into discrete, equally displaced angular positions to incrementally ldecrease the output of the audio circuit 48 and hence the volume of the loudspeaker 56.

inasmuch as the potentiometer shaft i9 is operative over a range of approximately 326 and is not adjustable throughout a range of 360, the contacts lt and l'd are serially connected in the energizing circuits for the motor control winding lo?. and ldd, respectively, to automatically open-circuit the motor 3% when the potentiometer shaft 49 reaches the upper and lower ends of its operative range. In this connection, position limit cams lil@ and l92 are so located on the control shaft 92 that the contacts llSli and ito automatically open incident to movement of the potentiometer shaft 49 into the respective ends of its operative range.

It will be understood that if the potentiometer shaft reaches the upper end of its operative range during the transmission of the second ultra-sonic signal, the cam i9?.

' opens the contact lt to open-circuit the motor control winding 162. Thus, even though the relay d6 is operative,

the motor 35S is deenergized and the driving connection trol winding 162 is returned to the control ot the relay itl only after the potentiometer shaft i9 is moved away from the upper end of its operative range. This result is obtained by transmitting a third ultra-sonic signal to effect the operation of the down relay ft2 and, thus, the energization of the rnotor control winding log. incident to energization of the motor control winding lieti, the potentiometer shaft dit is moved away from the upper end toward the lower end of its operative range, with the result that the cam i9@ is displaced to permit the contacts to close. rIhe closure of the Contact 156i thus rcturns the operation of the motor control winding E62 to the control of the up relay lil and, as long as the potenti` ometer shaft 49 remains in the middle of its operative range, the relay d@ exclusively controls the energization o the motor control winding to2.

It will be appreciated that the motor control winding ldd is also rendered inoperative when the potentiometer shaft d@ is at the lower end of its operative range since the position limit cam ld on ti e control shaft 92 opens the contacts 17d and, thus, opens the energizing circuit for the motor control winding 168. The successive transmission of third ultra-sonic signals repeatedly operates the dov/n relay 42 but does not effect the energization of the motor The contacts i576 are closed only atter a second ultra-sonic signal is transmitted to operate the relay itl and energize the rnotor control winding 16?., whereby the potentiometer shaft 49 is moved away from the lower end toward the upper end of its operative range. This movement of the potentiometer sha-ft 49 causes the cam 192 to be displaced to permit the contacts i76 to be closed, whereby the operation of the `motor control circuit lod is returned to the control of the relay d?. and its associated contacts ltl.

lf it is desired to change the channel to which the television receiver is tuned when the volume control is couditioned to be remotely controlled, the transmitter 24 is operated to cause the channel-volume selector resonator rod 70 to radiate a first ultra-sonic signal. The first ultrasonic signal, as indicated above, causes the discriminator '7S to supply a DC. pulse to the conductor Z7 and thus the grid of the control tube 79. The tube 79 is rendered conductive to complete the energizing circuit for the relay tt, whereby the relay armature Miti is actuated to cause the angulated finger lima of the arm 'lltlZ to move downwardly into the arm portions ltidc which, as described above, is located immediately beneath the angulated finger llilZa when the rocker 86 is in its HG. 2 position. The arm portion lilac guides the angulated fin-zer liti/'3a against its end lo@ (see FIG. V2) to cause the rocker 86 to move from the position illustrated in PlG. 2 toward its other operative position (not shown). When the rocker 86 moves beyond its center position, the over-center spring arrangement lilo coacts with the angulated finger ltlZa to move it to its operative position (not shown).

This movement of the rocker 36 causes the gear train 9u to be rendered ineffective by displacing the gear 122 upwardly out of driving engagement with the axially movable pinion gear 3@ and further causes the gear train 94 to be rendered eifective by displacing the gear l23 downwardly into its operative position to be drivingly engaged by the axially movable driving pinion 39. However, similar to the gear train 9i?, the gear train 94, at this time in its effective position is neither driven by the motor 3S nor is in driving engagement with the pinion gear Si@ of the motor 3S. In short, as described above, the transmission -of the first ultra-sonic signal only selects either the volume or channel selection control function for remote operation and does not in any way change the operative condition of either the volume or channel selection control function.

The movement et the rocher do into its operative position (not shown) additionally causes the volume control window 37; to be darkened and the channelselection window 132e to be illuminated. Specifically, the switch lita actuated by the rocker 8o opens the contacts 13d-a and closes the contacts lb. The opening of the contacts i3d-a opens the above-described energizing circuit for the bulb 1361), while the closure of the contacts 13% completes an energizing circuit for the bulb 32c, as follows: the six-volt AC. source, the conductor yi312, a conductor ist, the bulb lda, a conductor i159, the contacts It-tb, and the conductor 142 connected to the six-volt source. Consequently, the operator of the transmitter 24 is informed that the control system 2?; has selected the channel-selection control function to be remotely adjusted.

Once the channel-selection control function is selected the television receiver Ztl can be tuned to either a higher or a lower channel. lf it is desired to tune the receiver Ztl to a higher channel, the transmitter 24 is operated to cause the resonator rod 7l to transmit a second ultrasonic signal. This second ultra-sonic signal, as described above, causes the relay du to operate and its contacts i435 to close, thereby to complete the above-described energizing circuit for the motor control winding E62. Incident to energization of the motor 38, the motor driving shaft 38a simultaneously rotates in a clockwise direction and moves axially upward so that the pinion gear 39 moves into engagement with the input gear 123 of the gear train 9d. The clockwise rotation of the motor driving shaft 33a causes the control shaft 96 to rotate in a counterclockwise direction and, assuming that the mechanical connection S37 between the control shaft 9o and the tuning shaft #i provides a direct driving connection, the main tuning shaft 45 can be considered as also rotating in a countercloclcwise direction.

ln contrast to the incremental adjustment or" the potentiometer shaft t9 in the audio circuit 4S, the main tuning shaft d5 is rotated under the control of a programming mechanism E94 to assure that the main tuning shaft l5 is moved directly to an adjacent transmitting channel for the area in which the television receiver 2@ is located. ln this connection, the programming mechanism i9@ comprises thirteen cam buttons i595 mounted on a wheel 395 xedly secured to the control shaft $6, the cam buttons 1&5 coacting with a cam follower 197 that controls contacts w8 and Zilli. The cam buttons are referred to collectively as 95 `and individually as 19g-l, lf'i-Z, wil-5, E525-ll, 395-5, 1955-6, WS-7, ld-8, @5*9, wil-llt?, 19E-ll, 195412, and 19d-i3, the buttons i954, 5.954, lui-3, lgs-di, lQlS-S, l95-6, 19d-'7, lidi-S, i9S-9, @ti-lh, 1Std-lll, ld-ll ld-S, corresponding to channels l, 2, 3, etc. ln the Chicago area, for example, channels 2, 5, '7, 9 and ll are used and, hence, the buttons ld-2, @l-5, N5-'7, M15-9 and lQS-ll have outwardly extending cylindrical cumming portions to move the cam follower i9? radially outwardly to effect the opening of the contacts ld and '.lttl, while the buttons NfS-l., 2195-3, ld-fl, ld-6, M538, 3195-19, S-i, and ild are VVllattened to permit the cam follower 197 to move radially inwardly to effect the closure of the contacts t9@ and Zilli. it may be assumed that prior to transmission of the second ultra-sonic signal, the programming mechanism is in the position shown in FIG. 2 and, thus, the television receiver Zit is tuned to channel 2. As shown, the cam follower M7 coacts with the camming button EES-Z whereby the contacts 1% and Ztiti are maintained opened.

incident to transmission of the second ultra-sonic signal which eifects the operation of the motor 3, the control shaft 96 rotates iu a counterclocliwise direction to cause the button W5S-2 to move counterclocliwise out of engagement with the cam follower i9?. Tie cam follower t197, being inherently resiliently-biased toward the cam buttons 195, moves into engagement with the liattened portion of the button 1954i, thereby to close the contacts 198 and Zoe, the contacts 1% yand 2th? being closed during the transmission of the second ultra-sonic signal.

The closure of the contacts 198 performs no useful function since the frictional cam 159 mounted on the motor shaft 33a opens the contacts 182 when the motor driving shaft 38a rotates in a clockwise direction to prevent either the energizing circuit or the holding circuit for the motor control winding 168 from being completed. By this arrangement, both of the control windings 162 and M3 can never be simultaneously energized as a result of the operation of the transmitter 2.4 or the programming mechanism i912'. The closure of the contacts 2.6i) completes a holding circuit for the motor control winding d66, as follows: ground, cam follower lll97, contacts Zilli, conductor 202., the conductor 157, the contacts 158, conductor loll, the motor control winding 162, the conductor les, the A.C. source 166, and ground. Accordingly, the above-described holding circuit energizes the motor control Winding 162 independently of the abovedescribed energizing circuit controlled by the relay 4t) and its associated contacts 148. Some time after the holding circuit is completed, the transmission of the second ultra-sonic signal is ended with the result that the up relay itl is deenergized and its contacts leu are opened. The opening of the contacts MS opens the energizing circuit for the motor control winding l62 but, since the above-described holding circuit is completed under the control of the programming mechanism 194, the motor control winding 162 remains energized and the motor 3S continues to drive the main tuning shaft 45.

Returning to the operation of the programming mechanism 194, the counterclockwise movement of the control shaft 9d and the main tuning shaft i5 continues until the cam button -5 moves into engagement with the cam follower l9'7, whereby the cam follower ll is cammed radially outwardly to eiect the opening of the contacts i193 and Edil. The opening of the contacts 206 opens the holding circuit for the motor control winding to2 and causes the deenergization of the motor 38. Thus, the motor 3S is deenergized under the control of the Eprogramming mechanism 194i and the pinion gear 39 moves axially `downward into its inoperative position to break the driving connection between the motor 3S and the main tuning shaft d5, with the result that the movemeut of the tuning shaft 4S is arrested.

lf it is desired to tune the television receiver to channel 7 when the receiver is tuned to channel 5, the transmitter 24 is operated to cause the resonator 7l to transmit another second ultra-sonic signal. This second ultra-sonic signal causes the relay di) to operate and its contacts M8 to close, thereby to complete the abovedescribed energizing circuit for the motor control winding 162. Incident to energization of the motor 3S, pinion gear 39 again drivingly engages the gear train 9@ to cause the control shaft d6 and main tuning shaft 45 to rotate in a counterclockwise direction. The counterclockwise rotation of the control shaft 96 causes the button EWS-S to move out of engagement with the cam follower 1.97, whereby the resilient cam follower $.97 moves into engagement with the llattened part of the button @l5-5 to elfect the closure of the contacts 198 and Zitti. As previously described, the closure of the contacts lili? performs no useful function, while the closure of the contacts .Edil completes the holding circuit for the motor control winding N2. While :the cam follower l9'7 engages the button i956, the transmission ot the second ultra-sonic signal is stopped with 4the result that the relay di) is deenergized and its contacts 14S opened. The opening of the contacts -S opens .the energizing circuit for the motor control winding 162 but, since the holding circuit remains closed under the control of the programming mechanism 19d, the motor 38 remains energized. When the button l95-'7 moves into engagement with the cam follower E97, the cam follower 197 moves radially outward to open the contacts Zeil and to open-circuit the holding circuit for the motor control winding 162.. The motor 33 is thus deenergized and the movement of the tuning shaft l5 is arrested in its channel 7 position.

n the other hand, if it is ldesired to tune the television receiver to channel 2 when the receiver is tuned to channel 5, the transmitter 24 is opera-ted to cause the resonator rod 72 to transmit a third ultra-sonic signal. Tris third ultra-sonic signal causes the operation of the relay i2 yand the closure of its contacts lil. The closure of the contacts iF/'ll completes the above-described energizing circuit for `the motor control winding line, whereby the ymotor driving shaft 38a simultaneously rotates counterclocltwise and moves axially upward so that the pinion `gear 3?/ -drivingly engages the input gear i213 of the gear train 94. rl`he counterclockwise movement of the pinion gear 39 of the motor shaft 38a causes the 'control shaft 96 and the main tuning shaft i5 to rotate in a clockwise direction. The clockwise movement of the control shaft 96 causes the cam button @5 5 to move out of engagement with the cam follower' lll?, whereby the resilient cam follower lit? moves radially inward into engagement with the flat part of the button lit-fi to effect the closure `of the contacts 198 and 2nd, as described above. The closure of these contacts 198 and Zilli, as stated above, occurs during the transmission of the third ultra-sonic signal. Specifically, the closure of the contacts Zlio performs no useful function at this time, since the friction cam i159 mounted on the motor shaft opens the contact l in the holding circuit for the motor control winding M2 when the motor driving shaft 36a rotates in a counterclockwise direction. The closure of the contacts 1%, however, completes a holding circuit for the motor control winding 5.6% as follows: ground, cam follower E97, contacts 19S, conductor Eile, the conductor ld, the contacts lSZ, the conductor llil, the motor control winding 16%, the conductor lod, the A.C. `source ico, and ground.

During the clockwise movement of the programming mechanism i946, i.e., when the cam follower i9? coacts with the 'lat portion of the buttons 1953-4 and l95-3, the transmission of the third ultra-sonic signal is ended with the result that the relay l2 is deenergized and its associated contacts T172 are opened. The opening of the contacts ll72 opens the energizing circuit for the motor control winding 163 but, since the holding circuit is completed under the control of the programming mechanism 1%, the motor remains energized. When the button T1954?. moves into engagement with the cam follower 33197, the cam follower l97 moves outwardly to open the contacts CWS, whereby the holding circuit for the motor control winding ller? is opened. Accordingly, the motor i3d is -deenergized and the main tuning' shaft 45 is stopped in its channel 2 position.

ln the event it is desired to tune the receiver Ztl to channel 9 when it is tuned to channel 2 and assuming that there are stations transmitting in channels 2, and 7, the transmitter Z4 is operated to radiate a second ultra-sonic signal to eect the movement of the main tuning shaft l5 from its channel 2 position to its channel 5 position under the control of the programming mechanism ld. After the operation of the programming mechanism is completed, the transmitter 2li is operated `again to transmit another second ultra-sonic signal. Fi`his ultra-sonic signal causes the programming mechanism lil/i to move the main tuning shaft l5 from its channel 5 to its channel 7 position. Thereafter, the transmitter Zd is operated again to transmit still another second ultra-sonic signal to cause the programming mechanism i945 to move the main tuning shaft i5 from its channel 7 to its channel 9 position. llt should he understood that it is necessary that the successive ultra-sonic signals radiated from either the up or down resistor rods '7l or 72 be transmitted after the programming mechanism 11% completes its operation-otherwise the up relay in or the down relay i2 are energized and deenergized prior to completion of the operation of the programming mechanism ifi-i and have no effect on the motor control windings loi and lod.

lt will he appreciated that when the potentiometer shaft 49 is at either the upper or lower end of its range so that the position limit cams or @E open the contacts ld or lo, the receiver 2li could not be tuned to a lower or a higher channel, respectively, were it not for an interloclc arrangement, identified generally as Zlio. Specifically, vhen the potentiometer shaft i9 is at the upper end of its range, the contacts l5@ are opened and, in the absence of the interlock arrangement 2do, the energizing circuit for the motor control winding le?. would be opened. Accordingly, if channel control function is selected, the motor control winding M2 could not he energized to tune the receiver 2li to an adjacent higher channel, since the motor control winding to2 is open-circuited by the opened contacts To o'oviate this undersirable result, the interlocking arrangement 2% eectively short-circuits the contacts and 17e when the roeier 86 is in its operative position (not shown) and the control shaft 9d is conditioned to be driven hy the motor 3S. To this end, a cam is lixedly secured to the rocker $6 to coast with the contacts @in and 23.2. The contacts Z'itl are electrically connected across the contacts l5@- by conductors and 2in, while the contacts 2li are electrically connected across the contacts fo hy conductors 211.3 and 22?. Hence, assuming that the volume control function is selected and that the potentiometer shaft i9 is at the upper end of its range so that contacts ldare opened, the transmission of a first ultra-sonic signal causes the rocker de to move from its FlG. 2 position into its operative position (not shown), with the result that the cam moves upwardly to effect the closure of the contacts and 2ML. rfhe closure of the contacts 2i@ completes the shunt-circuit across the opened contacts i154 so that the energization of the motor control winding lr6?. is placed under the control of the relay itl and its assoelated contacts ldd only, while the closure of the contacts 2li/ completes the shunt circuit across the contacts 176 y so that the energization of the motor control winding i168 is placed under the control of the down relay i2 and its associated contacts lill only. Hence, even though the potentiometer shaft i9 is at the upper end of its range,

the transmission of a second ultra-sonic signal causes the relay d@ to operate and its associated contacts Mil to close, thereby to complete the energizing circuit for the motor control winding 162 through the shunt-circuit across `the contacts l'ff comprising conductor 2M, contacts 2li?,

and conductor Zio. Consequently, the motor control winding lo?. is energized independently of the position limit cam la@ and its associated contacts 154 and remains energized under the control of the programming mechanism i9@ to move the main tuning Shaft d5 to an adjacent higher channel position.

On the other hand, assuming that the potentiometer shaft il@ is at the lower end of its range when it is desired to tune the receiver E@ to a lower channel, the transmission of a second ultra-sonic signal causes the relay ill to operate and its associated contacts lieti to close, thereby to complete the energizing circuit for the motor control lo@ through the shunt-circuit across the contacts lo comprising the conductor Zilli, contacts 2 i2, and conductor 229.

Thus, the motor control winding 168 is energized independently of the position limit cam llZ and its associ ated contacts 76 and remains energized under the control of the programming mechanism 1% to move the main tuning shaft l5 to an adjacent lower channel position.

The contacts and ifi-6 in the energizing circuits for the motor control windings lo?, and lio-3 are rendered effective independently of the contacts. El@ and 2l?, when the volume control function is again selected. ln this connection, in response to a lirst ultra-sonic signal, the rocker 8o moves from its operative position (not shown) into its FIG. 2 position, whereby the cam 208 moves downwardly to effect the opening of the contacts 210 and 212. The opening of the contacts 210 and' 212 opens the shunt circuits across the contacts 154 and 176, thereby to render the contacts 154 and 176 effective again. However, even though the potentiometer shaft `49 is at either the upper or lower end of its range so that either the contacts 154 or 176 are opened, the motor control winding 168 or motor control winding 162 can be energized by transmission of a third or second ultra-sonic signal, respectively, to effect the rotation of the shaft 49 away from the upper or lower end, respectively, of its range, thereby to open the contacts 154 or 176 and return the energization of the control windings 162 or 168 to the control of the up relay 40 or the down relay 42.

It should be appreciated that although the FIG. 2 embodiment has been described as controlling the channel selection and volume control functions of a television receiver, the FIG. 2 embodiment is designed to control any two control functions of the receiver 20. However, the channel selection and volume adjustment are the two most frequently changed control functions and have been used for illustrative purposes only.

In a slightly different form of the FIG. 2, three-button, incremental adjustment embodiment, three control functions instead of two control functions can be remotely controlled by the remote control system 22. In this connection, three gear trains, instead of two gear trains, are sequentially rendered effective under the control of a first relay similar to the selector relay 30, and are subsequently driven by a motor driving means under lthe control of two relays, similar to relays 40 and 42. Specifically, a stepper arrangement is substituted for the rocker 86 and in response to successive operations of the first rel-ay, the three input gears of the three gear trains are sequentially moved downwardly into positions to be drivingly engaged by the driving means of the motor. To this end, the pinion gear on the motor and the input gears are of such relative size that three input gears can be oriented around the pinion gear of the motor at approximately 120 apart from one another. In fact, it will be appreciated that any number of gear trains can be provided to control all the manually adjustable control functions of the receiver 20, vprovided the pinion and input gears are properly dimensioned andthat a properly designed stepper arrangement is used. With the three-gear train arrangement, the channel selection, volume, and fine tuning or contrast or brightness control functions, for example, can be remotely controlled by the remote control system 22. In any event, the desired control function is selected by successively radiating first ultrasonic signals, and once selected its operative condition is changed by successively y radiating either second or the third ultra-sonic signals, as described above.

Considering now the constructional details of the selector 32, the bidirectional motor 38, the gearing mechanism 88, and the rocker assembly 85 are fixedly secured to a frame 230 comprising a pair of spaced-apart plates 232 and 234. The plates 232 and 234 are maintained in fixed spaced-apart relation by a plurality `of spacer sleeves 236 which are secured to and extend between the plates` 232 yand 234 by a plurality of fasteners 238. As -best4 shown in FIG. 3, the core of the motor 38 is seated on a plurality of spaced-apart sleeve supports 240 to be spaced from the plate 234. The sleeve supports 240 respectively accommodate fasteners 242 which extend through aligned openings (not shown) defined in the plate 234, the motor core, and a motor bracket 244, the v heads of the fasteners 242 being seated `against the brackets 244 and the ends of the fasteners being peened over the upper surface of the plate 234 thereby to fixedly secure the motor 38 to the frame 230. An aperture (not shown) is provided in the plate 234 to permit mechanical interconnection between the motor 38 and the gearing means 88 located between the plates 232 and 234.

The electric motor 38 comprises a four pole, A.C., squirrel-cage motor which is energized under the control of the relays 40 and 42 to effect, respectively, clockwise and counterclockwise rotation of the motor output driving means comprising the output shaft 38a on which is mounted the output pinion gear 39. The pinion gear 39 and the output shaft 38a extend through and are axially movable with respect to plate 234, as described in detail hereafter, to drivingly engage selected gears in the gearing mechanism 88. The motor 38 includes the motor control winding 162 and the motor control winding 168 (FiG. 2) wound about its laminated core 248 (FIG. 3). The core 248 includes right-angularly related cross arms -in which is defined pairs of opposing pole pieces (not shown) which have generally curved surfaces defining a cylindrical opening for a rotor (not shown). The rotor is fixedly mounted on the driving shaft 38a which, in turn, is rotatively supported from a pair of spaced-apart bearing assemblies 250 and 252 respectively secured to the plate 234 and the motor bracket 244.

In addition to the rotor being rotatively movable, it lis also axially movable relative to the bearing assemblies 250 and 252. Specifically, the rotor is movable between an inoperative position, i.e., displaced from the pole pieces when the motor 38 is deenergized, and an `operative position, i.e., in alignment with the pole pieces when the motor 38 is energized. The rotor is maintained in its downward inoperative position by a coil spring 254 wound about the output shaft 38a, the spring being located between the rotor and the bearing assembly 250, as shown in'.

FIGS. 3, 5 and 7. However, when either of the control windings 162 or 168 are energized, the force of the spring .v is overridden and the rotor is drawn into the magnetic field developed across the pole pieces to assume an upward position centrally of the pole pieces. By the above construction, as the motor 38 is energized and deener. gized, the rotor moves between its upward operative and downward inoperative positions, thereby to move the output driving shaft 38a and the output pinion gear 39 upwardly and downwardly relative to the gearing mech-l anism 88.

Considering now the gearing mechanism 88 in greater'v detail, it comprises, as stated above, a first gear train 90 for drivingly interconnecting the motor 38 with the control shaft 92 and a gear train 94 for drivingly interconnecting the motor 38 with the control shaft 96. The gear trains 90 and 94, respectively, include input gears 122 and 123 which are axially movable under the control of the rocker assembly 85. The gears are so controlled by the rocker assembly that they are alternately moved into operative position to be 39 of the motor motor 38 into driving engagement with the input gear 123 to cause rotation of the control shaft 96, the direction of input gear 122 to cause rotation of the control shaft 92, the direction of the rotation of the shaft 92 render either the gear train or the gear train 94 effective.

Considering now more specifically the gear trains 99 and 94 and considering first the gear train 9G, the input gear 122 is fixedly secured to a spindle 118 which is journaled in the plates 232 and 234 for axial movement under the control of the rocker assembly 85. The input gear 122 comprises a spur gear 12251 adapted to be drivingly engaged by the pinion gear 39 and, further, a pinion gear 122b drivingly connected to the spur gear 12441 of the drivingly engaged by the driving pinion- 38. With the rocker assembly in the, operative position illustrated in FIG. 5, the axially mov-t, able pinion gear 39 is movable under the control of the being depen` l ent upon the direction of rotation of the motor shaft 3811.,- lThus, prior to operation of the motor 38, the rocker assembly 85 is operated under the control of the relay 30'to idler gear 124. The gear i2@ is iixedly-secured to a shaft 260that is journaledin the plates 232 and 234. rille gear-Y 1-2tincludes a pinion gear 124th in driving engagementi with the gear 126 which is fixedly secured to the control shaft 92- suitably journaled in the plates 232 and Similarly, the input gear 123 of the gear train 94'is xedly secured to a spindle 12d which is' journaled in tlie'plates 232 and 234 for axial movement under the control of the rocker assembly 8S. The input gear 123includes a spur gear 123a adapted to be drivingly engaged by the pinion gear 39, and, further, a pinion gear 12311 in driving engagement with the spurv gear 125e of the idler gear 125. The idler gear 125 is suitably secured to a shaft 262 journaled in the plates 232 and 234i and includes a pinion gear 125b in driving engagement with thev spur gear 127 iixedly secured to the control shaft 96. Similar to the control shaft 92, the control shaft 96. is journaled in the plates 232 and 234.- As best seen in FIGS. and 7, the spindles H8 and 120 are so spaced apart that the input gears 122 or 123 are positioned to be drivinglyengaged by the pinion gear 3% as it is axially moved into its upward position by the motor 38.y Hence, depending upon the position of the rocker assembly 8S', either gear train gi) or @die rendered effective to be drivingly engaged by the motor 38 in order` to provide a driving connection to either of the control shaft 92 0r 96.

The rocker assembly 85 is controlled by the relay Si@` which is suitably Secured to the upper surface of the plate 232. The relay 8@ includes a winding 38a wrapped around a cylindrical magnetic core 264 suitably secured to the horizontal leg 266i: of an Lf-shaped magnetic structure'Zd. The vertical leg 266i; includes a recessed portion 268 at its upper end to accommodate a pair of keyways 269 defined transversely in the armature d (see FIG. 4); The armature 1%' is biased into its inoperative position illustrated in FIG. 3 by a coil spring 272 connected at its upper end to an arm 102 carried by the armature 160 and connected at its lower end to an angulated bracket 274 suitably secured by a fastener 277 to thevertical leg 266b. The armature lillois generally U-shaped in section and includes a pair of apertures 275' defined in its arms 10001 for accommodating the arm 182. The apertures 275 are oversized to permit the arm 102 to freely rotate relative to the armature 108. The arm 102 has'a configuration best shown in FIG. 3 and includes an angulated nger'1tl2a which coacts with an angulated wire 276` connected to the plate 232 by a fastener 278. The wire 276; as seen in FlG. 5, includes a vertical support portion 276e and a finger-engaging, inverted V-shaped portiony 276b. The apex of the finger-engaging portion 276b coacts with the horizontal part of the angulated `finger 102e when the relay 30 is deenergized and prevents the disassembly of the armature 184B and the armature structure 266. The wire 276 also functions to position the angulated finger 18261 in a predetermined position relative to the rocker 86 when the relay 30 is deenergized. Asy shown in FIG. 3, the extreme tip of the angulated `finger 10251 coacts with the slot structure 1M provided inthe rocker 86 so that incident to energization ofthe relay 30 the rocker 86 is actuated to render eiective either the gear train 98er the gear train 94.

Considering now the rocker 86 in greater detail, and referring primarily to FiGS. 5 and 7, the rocker 86 is pivotally supported on a pivot pin 87 suitably mounted to a bracket which is secured to the plate 232. The rocker 86,1 in addition to being controlled by the angulated finger 10261, is also controlled by an overcenter spring mechanism 186 interconnecting the rocker 86 and the plate 232. Thus, the rocker 86 pivots under the joint control of the angulated finger 102e and the over-center mechanism 106 between a position illustrated in FlG. 5 wherein it is inclined downwardly to the right and a position illustrated in FIG. 7 wherein it is inclined downwardly to the left. The over-centerspring mechanism 1% includes a coiled spring 286 connected at its uppery end' to aA hook` 2125 20 mounted adjacent the slot structure 184i at'the upper portion of the rocker 86 and at its lower end to a stud 287 suitably secured to the plate 232. By this arrangement, the rocker 86 moves into either of its FlG. 5 or FIG. 7

positions after it passes its center position under the jointy control of the compressiveforce of the spring 28d-and the angulated finger 102:1. Moreover, the spring 286 acts to bias the rocker 86 into its FIG. 5 and FG. 7 positions after it is moved between these positions and, accordingly, the relay armature 18@ must develop enough force to overcome the force of the spring 286 in order to move the rocker86.

The pivotally movable rocker 86 is mechanically connected to the input gears 222 and 223, respectively, and, thus, effects the ne-cessary vertical displacement of the input gears 122 and 123 incident to operation of the relay 38. The displacement of the rocker 86 is transmitted to the input gears 122 and 123 by spindle and disc arrangements. To this end, there is dened in the vertical edges of the rocker 86, as seen in FIG. 2, a'pair of horizontally extending openings 11G and lf2, respectively, which include reduced neck portions adjacent the outer ends of the openings. The openings 110 and 112 respectively accommodate discs 114 and 116 which are fixedly secured to the spindles 118 and 120,- respectively. Since the spindles 118 and 126` rotate whenV the respective gear train or 94 isrendered operative, the-neck portions of the openings or 112 providelbea-ring surfaces for-the rotating discs118 and 120, respectively. Further, the neck portions are so configured that unencumbered rotation of the discs 118 yand 120 is permitted, irrespective of the position -of the rocker 86.

Furthermore, the discs 114-and 116 are so located on the spindles 118 and 128, respectively, that when( the rocker 86 is in its FIG. 5-position, ythe input gear 123 of the gear train 94vis in its downward operative position 'to be drivingly engaged by the axially movable pinion gear 39, while the gear 122 lof the gear train 90- isin its upward inoperative position out =of driving engagement with `the axially movable pinion gear 39. Cone versely, with the rocker 86k in its FIG. 7 position, the input gear 122 of the gear ytrain 901 is in its downward operative position to be drivingly engaged by theaxially' movable pinion gear 39', while the input gear 123 of the gear train 9'4 is in its upward inoperative positionout of driving engagement with the axially movable pinion. gear 39.

Referring now to 'the operation of the relay 3&1J` and its actuation ofthe rocker assembly 85, the rockerv 86 is moved between its operative positions shown in FIGS. 5 and 7 under the joint control of the angulated finger 102erl andthe spring mechanism 1016. AsV indicated.

structure 104 which is of generally inverted Y con-V figuration and'specifically includes a vertically extending:

leg portion 104e extending into a downwardly and leftwardly extending arm portion-104b-and a downwardly and rightwardly extending armportion 184C. The portions 104bfand 104e dene therebetween a generally triangular portion 29'8 having an apex located along the center line `of the/vertical leg portion 104e. When the relay 30 isdeenergized and the rocker 86 isU in either its FIG. 5 or FIG. 7 position, the angulated ringer 102a seats in the apex iof 'the horizontal portion 276b of the Wire 276. As clearly seen in FIGS. 5 and 7, the triangular part 2,98 of the rocker 86 is displaced fon either side of the angulated finger 102e: so that incident to downward movement of the armature 100,l the finger 182e passes into either the slot 104b-or,104c, thereby to move the rocker'ou-t of its FIG'. 7 or FIG.,5 position, Morespeloifically, assuming that the rocker 86 is in its FIG. 5 position, it will be observed that the partr 298 of the rocker 86 is located to the right of the angulated nger 18251 seated in the apex of the wire portion 2'l6b. Thus, the downwardly moving inger 102a .passes downwardly 21 through the leg portion 104e and into the arm portion 104b with the result that the finger 102a moves downwardly to the left to engage Ithe end part 108 of the arm portion 104b and rock the rocker 86 out of its FIG. 5 position. During this movement, the linger 102a and in fact the entire arm 102 is rotated relative to the armature 100. Conversely, with the rocker 86 in its FIG. 7 position, it will be observed that the triangular part 298 is located Vto the left of the angulated finger 1ti2a seated in the apex of the wire portion 27617. Thus, the downwardly moving -angulated linger 102e passes downwardly through the leg portion 10d-a into the arm portion 104e, with the result that the angulated finger 102a moves downwardly to the right Ato engage the end part 109 or t-he arm portion 104C to rock 'the rocker 86 out of its FIG. 7 position. As the linger 102g moves through the arm portion 104C, the entire arm 102 is rotated relative to the armature 100.

Returning now to the movement of the rocker 86 from its FIG. 5 to its FIG. 7 position, when the rocker 86 moves beyond its over-center position, the over-center spring mechanism jointly with the angulated finger 2a moves the rocker 88 into its FIG. 7 position. As is well known, the compressive force of the spring 286 acts on the pin 295 at `the upper end of the rocker 86 to pivot the rocker 86 into its FIG. 7 position. Incident to deenergization of the relay 30, the armature 100 moves upwardly under the control of the coiled spring 272, whereby the angulated nger 102:1 freely passes upwardly through the arm portion 104b and the leg portion 104a to engage the apex of the wire portion 276b. The arm 102, during its upward movement, rotates relative to the armature 100.

in operation, .assuming that the rocker assembly 85 is in the position illustrated in FIG. 7 and that counterclockwise rotation of the control shaft 96 is desired, the relay 30 is operated to cause the rocker 86 to move from the position illustrated in FIG. 7 to the position illustrated in FIG. 5, Thereafter, the motor 38 is energized so as to cause a clockwise rotation of the pinion gear 39. Incident to energzation of the motor, the motor shaft 38a and associated pinion gear 39 simultaneously rotate in a clockwise direction and move axially from the position illustrated in FIG. 5 to the position illustrated in FIG. 6, wherein the pinion gear 39 drivingly engages the input gear 123 of the gear train 94. The driving connection from the motor 38 to the control shaft 92 is as follows: the pinion gear 39, the spur gear 123:1, the pinion gear 123b, the spur gear 125a, the pinion gear 125b, the spur gear 127, and the control shaft 96. With the above-described connection, the control shaft 96 rotates in a counterclockwise direction at a constant speed determined by the rated speed of the motor 38 and the gear reduction of the gear train 94. In the event that a clockwise rotation of the control shaft 96 is desired, the motor 38 is so energized that counterclockwise rotation of the pinion gear 39 is obtained.

In order to stop the rotation of the control shaft 96, the motor 38 is deenergized with the result that the magnetic field developed across the pole pieces collapses and the rotor axially moves under the control of the spring 254 to its inoperative position, partially displaced downwardly from the pole pieces. Accordingly, the motor output shaft 38a and the pinion gear 39 move axially into the position shown in FIG. 5 out of driving engagement with the input gear 123.

In the event that counterclockwise rotation of the control shaft 92 is desired, the relay 30 is operated to cause the rocker assembly 85 to move from the position illustrated in FIG. 5 to the position illustrated in FIG. 7. Thereafter, the motor 38 is energized so that the pinion gear 39 simultaneously rotates in a clockwise direction and moves axially into driving engagement with the input gear 122 of the gear train 90. The drive connection from the motor 38 to the control shaft 92 is as follows:

the spur gear 122a, the pinion gear 1221;, the spur gear 124a, the pinion gear 124b, the spur gear 126, and the control shaft 92. With the above-described connection, the control shaft 92 rotates in a counterclockwise direction at a constant speed determined by the rated speed of the motor 38 and the gear reduction of the gear train 90. On the other hand, if clockwise direction of the control shaft 92 is desired, the motor 38 is energized so that counterclockwise rotation of the pinion gear 39 is obtained.

In a selector 32 built in accordance with the principles of the present invention, it has been observed that infrequently there is a tendency for the pinion gear 39 during its axial movement to abut the sides of the input gears and move them upwardly out of driving engagement with the pinion gear 39. This operation is occasionally achieved even though the teeth of the pinion gear 39 are slightly tapered adjacent its upper end to facilitate meshing with the teeth on the input gears 122 or 123. In order to maintain the input gears 122 or 123 in their respective operative positions, the spring 286 embodied in the over-center mechanism 106, acting in tension, positively biases the input gears 122 or 123 into their operative positions. Thus, when the teeth of the pinion gear 39 abut against the sides of the teeth of the input gears 122 or 123, the biased input gears 122 or 123 oppose the axial movement of the gear 39 and are moved only slightly upwardly until the teeth on the rotating pinion gear 39 mesh with the input gear.

In addition to the input gears 122 and 123 being maintained in their operative positions by the over-center mechanism 106 during driving engagement with the pinion gear 39, the input gears 122 and 123 are also maintained in their operative positions electromagnetically. In this connection, plates 299, made of magnetic material or the like are suitably secured to the lower ends of the axially movable spindles 118 and 120. Thus, when the spindle 118 or 120 is in its downward operative position .as shown in FIG. 5 or FIG. 7, the corresponding plate 299 is positioned within the electro-magnetic field developed by the control windings of the motor 38, with the result that the magnetic flux lines produce in the spindle 118 or 120 a downward force which opposes the axial movement caused by the pinion gear 39.

Referring now to the FIG. l0, four-button incremental adjustment embodiment of the present invention, attention is directed to FIG. 9 wherein the remote control system is illustrated diagrammatically and is generally identified by reference numerals 322. trol system 322, similar to the above-described remote `control system 22, includes a portable transmitter 324 f second, third,

adapted to transmit ultra-sonic signals to a control systern 323 associated with a ltelevision receiver 20. The transmitter 324 is similar to construction and operation of the previously-described transmitter 24, with the exception that it functions to radiate four ultra-sonic signals instead of three ultra-sonic signals, the four ultrasonic signals having the following frequencies: 38.285 kc., 39.285 kc., 40.805 kc. and 41.805 kc. The control system 323 includes a microphone 326 which converts the ultrasonic signals into electrical signals as described above. The electrical signals are fed into a four-frequency selective amplifier network 328, similar in construction and operation of the above-described amplifier network 28.

and fourth ultra-sonic signal, the amplifier causes conductors 327, 329, 331 and 333, to be energized with D.C. pulses. The con- 329, 331 and 333 are respectively electrically a channel-up relay 330, a channel-down relay 332, a volume-up relay 334, .and a volume-down relay 336. Each of these relays 330, 332, 334, and 336 operates, in response to the transmission of one of the above ultrasonic signals, to simultaneously operate both network 328 respectively, ductors 327, connected to a selector 38 and a prime mover 340. In contrast withA The remote vcon- In response to the transmission of the first,`

the FIG. 2, three-button incremental adjustment embodiment wherein the selector 32, in response to one ultrasonic signal first conditions one control function for remote operation and thereafter is operated by the prime mover 3B, in response to a different ultra-sonic signal, to adjust the condition of the selected control function, in the FIG. l0, four-button, incremental adjustment embodiment, they selectorv 333 .and prime mover 340 are simultaneously operated in response to the transmission of only one of four distinguishable ultra-sonic signals to produce a predetermined output from the selector 338 to adjust the operative condition of one control function. Similar to the FIG. 12 embodiment, however, the repetitive transmission of one of the four ultra-sonic signals successively changes the operative condition of either the channel or volume control function of the television receiver 2t).

Considering now the FIG. l four-button incremental adjustment embodiment in greater detail and referring specifically to FIG. l0, the transmitter 324 is of the acoustic resonator type and comprises four resonator rods 370, 371, 372, and 373 individually supported from a casing 374Y and identified as a channel-up rod 370, channel-down rod 371, volume-up rod 372, and volume-down rod 373. As above, each of the resonator rods 370, 371, 372 and 373 is adaptedy to be shock-excited by a manually-operable hammer .or' the like (not shown) to produce an ultra-sonic signal. The signals transmitted by the rods 370, 371, 372 and 3'73 have, for example, the following frequencies: 38.285 kc., 39.285 kc., 40.805 kc. and 41.805 kc., these ultra-sonic signals being referred to hereafter as first, second, third, and fourth ultra-sonic signals. As previously suggested, the first and second ultra-sonic signals effect the operation of the channel-up relay 333 and the channel-down relay 332 to cause the control system 323 to tune the receiver 20 to either a higher or lower channel. Moreover, successively transmitted first or second ultra-sonic signals cause the control system 323 to directly tune the television receiver 20 to the desired higher or lower channel. On the other hand, the third and fourth ultra-sonic signals effect the operation of the volume-up relay 334 and the volumedown'relay 336, respectively, to cause the control system 322 to increase or decrease the operative condition of the volume control function. Accordingly, the third or fourth ultra-sonic signals are successively transmitted until the desired sound level of the receiver is obtained.

Each of the first, second, third, and fourth ultra-sonic signalsv radiated by the resonator bars 370, 371, 372 and 373 is detected by the microphone 326 embodied in the input circuit of the control system 323. The electrical output of` the microphone 326 is coupled to a four-frequency selective amplifier network 328 which includes an amplifier, similar to the above-described` .amplifier 76, for amplifying the low level signal developed byy the microphone 326. These electrical signals amplified by the amplifier are fed into a discriminator similar to the above-described discriminator 78. However, in contrast to theabove-described discriminator 78, the discrimnator causes a DC, pulse to be supplied to the conductor 327 in response to the first ultra-sonic signal, a D C. pulse to bek supplied tothe conductor 329 inv response to a second ultra-sonic electrical signal, a D.C. pulse to be supplied to the conductor 331 in response to a third ultra-sonic signal, and a D.C. pulse to be supplied to the conductor 333 inV response to a fourth ultra-sonic signal. The conductors 327, 329, 331 and 333 are respectively connected to the grids of negativelybiased, control tubes 379, 380, 381 and 382 which are rendered conductive by the application of D.C; pulses to their respective grids. As shown, the plate circuits of the control tubes 379, 380, 381 and 382, respectively, include the control windings 330a, 332a, 334a, and 336g, of the channel-uprelay 330, the channel-down relay 332, the volume-up relay 334, and thevolume-down relay 36.

As mentioned above, each of the relays 330, 332, 334 or 336 operates to actuate the selector 338 and simultaneously to electrically energize the prime mover 340. The selector 333 comprises a rocker assembly including a rocker 386 mechanically associated through spindle and disc arrangements, similar to the arrangements described above, with gear trains 390 and 394 of gearing mechanism 388, the gear trains 390 .and 394 being identical in construction and operation to the above-described gear trains 9i! and 94. More specifically, the rocker 386 is substantially identical in construction and operation to the rocker 86, `and is moved into a first operative position (not shown) under the control of either the channelup relay 330 or the channel-down relay 332 and is moved into its other operative position, shown in FIG. 10, under the control of the volume-up relay 334 or the volumedown relay 336. As a result of the operation of either of the channel relays 330 or 332, the rocker 386 renders the gear train39t) effective and energizes the prime mover 344i comprising a conventional electric motor to provide a driving connection with a controlv shaft 392 mechanically connected as indicated by the dotted line 393 to a volume potentiometer shaft, identical to the potentiometer shaft 49 located in the audio circuit 48 of the television receiver 20. Since the receiver is shown in block form in FlG. 2 with the shaft 49, the potentiometer shaft controlled by the FIG. l0 embodiment is hereinafter identified as 49. As a result of the operation of either of the volume relays 334 or 336, the rocker 386 renders the gear train 334 effective and energizes the electric motor 340 to` provide a driving connection with a control shaft 396 mechanically connected as indicated by the dotted line 397 to main tuning shaft (not shown) of the receiver circuit 44 of the television receiver 20, the main tuning shaft being hereafter identified as 45. Since the rocker assembly of the selector 338 and the motor 340 are simultaneously operated under the control of each of the relays 330, 332, 334 and 336, the motor 340 drives either the main tuning shaft 45 or the potentiometer shaft 49 in a direction corresponding to the direction in which the motor 349 is rotated. Actually, the channel-up relay 330 andthe volume-up relay 334 each energizes the motor 340 so that itsdriving shaft 340a drives either the main tuning shaft 45 so as to tune the receiver 20 to a higher channel or the potentiometer shaft 49 so as to increase the sound level of the receiver 20. On the other hand, the channel-down relay 332 andvolume-down relay 336 each energizes the motor 340 so that its driving shaft 341m drives either the main tuning shaft 45 so as to tune the receiver 20 to a lower channel or the potentiometer shaft 49 so as to decrease the sound level of the receiver 23. Assuming that the channel selection control function is Aselected and it is desired to increase the sound level of the television receiver 20, the transmitter 324 is operated. to cause the volume-up resonator rod 372 to radiate a thlrd ultra-sonic signal. rl`he third ultra-sonic signal is converted by the microphone 326 into an electrical signal which is fed into the amplifier network 328. This electricalI signal causes the discriminator to apply a D.C. pulse to the conductor 331, thereby to render the tube 381 conductive. The `conductive tube 381 completes an energizing circuit for the relay 334, as follows: ground, control tube 381, conductor 385, relay winding 33411 and B-plus. The operation of the relay 334 causes its armature 404 to move downwardly into engagement with a rod 410 xedly ysecured to the left sidefof the rocker 386. The rocker 336, being pivotally mounted to a suitably supported pivot pin 387, moves from its operative position (not shown) toward its FIG. l0 operative position under the control of the relay 334. However, afterl the rocker 386 moves beyond its center position, an over.

center spring mechanism 412 jointly controls the rocker 386 and moves'it into its FIG. l0 position. This movement of the rocker 386 renders the gear train 394 ineffec- 25 tive and renders the gear train 390 effective, as described hereinafter.

The downwardly moving armature 404 of the volumeup relay 334, simultaneously with its actuation of the rocker 386, effects the energization of the motor 340. More specifically, the downwardly moving armature '404 closes a pair of contacts 422 to complete an energization circuit for a motor control winding 462 of the motor 340, as follows: ground, contacts 422, a conductor 423, contacts 424 controlled by a position limit cam 451 mounted on the control shaft 392, conductor 425, conductor 426, contacts 427 controlled by a friction cam 450 mounted on the motor shaft 44041, conductor 428, motor control winding 462, conductor 429, an A.C. source 430, and ground. The energization of the motor 340 causes its shaft 340a simultaneously to rotate in a clockwise direction and move axially in an upward direction as viewed in FIG. l0. Thus, the pinion gear 339 secured on the shaft 348e: is rotated clockwise and axially moves into engagement with an input gear 405 of the gear train 390. Thus, in contrast to the previously described FIG. 2 embodiment wherein one of the gear trains is conditioned to be drivingly engaged by the subsequently energized motor,

in the FlG. l embodiment the gear train 390 is renderedv effective at the same time as the motor 340 is energized, thereby to immediately obtain a driving connection between the motor 340 and the control shaft 392.

Returning now to the operation of the rocker 386 resulting from the transmission of the third ultrasonic signal, the movement of the rocker 386 from the position (not shown) to the FIG. operative position renders the gear train 394 ineffective by displacing its input gear 411 upwardly out of driving engagement with the axially movable pinion gear 339 and further renders `the gear train 390 effective by displacing its input gear 405 downwardly to `be drivingly engaged by the axially movable pinion gear 339. As illustrated, the rocker 386 is mechanically connec-ted to the gear trains 390 and 394 through spindle and disc arrangements, identical in construction to the above-described spindle and gear arrangement of the FIG. 2 embodiment. To this end, the left and right edges of the rocker 386 are slotted to provide openings 432 and 434 which respectively accommodate suitable discs 436 and 438, the openings 432 and 434 -and the discs 436 and 438 being identically constructed to the above described rocker openings 110 and 112 and discs 114- and 116. The discs 436 and 438 are fixedly secured to spindles 435 and 437, respectively, whichfare journaled in suitable means so as to permit rotation and axial movement of the spindles. The lower ends of the spindles 435 and 437, similar to the lower ends of the spindles 118 and 120, are secured to the input gears 405 and 411 of the gear trains 390 and 394, respectively. With the input gear 411 of the gear train 394 in its upward position, the axially movable pinion gear 339 is unable to engage and drive the gear train 394 comprising the input gear 411, idler gear 413 and spur gear 415 secured to the control shaft 396. However, with the input gear 405 of the gear train 390 in its `downward position, it is readily engageable by the axially movable pinion gear 339 which moves into driving engagement with the gear 405 at about the same time that the gear 405 moves into its downward position. Accordingly, a drive connection is effected between the motor 340 and the volume potentiometer 49, as follows: the pinion gear 339, the input gear 405, an idler gear 407, a spur gear 409, the control yshaft 392, and the mechanical connection 393 interconnecting the control shaft 392 and the potentiometer shaft 49. Thus, the clockwise rotating pinion gear 339 causes the potentiometer shaft 49 to rotate counterclockwise toward the upper end of its range to increase the output of the audio circuit 48 and, hence, the sound level of the receiver 20.

Similar to the FIG. 2, threeabutton, incremental adjustment embodiment, the potentiometer shaft 49 rotates only duringthe transmission of the third ultra-sonic signal and, accordingly, at the end of its transmission the relay 334 is deenergized so that the armature 404 moves uph wardly to open the contacts 422 and open the energizing circuit for the motor control winding 462. Thus, the motor 340 is deenergized, the driving connection betweenthe motor 340 and the gear train 390 is broken, and the movement of the potentiometer shaft 49 is stopped. It will be appreciated that the sound level of the receiver 20 is incrementally increased proportionately to the duration of transmission of the third ultra-sonic signal and if the sound level obtained is not high enough, it can be incrementally increased by successively transmitting third ultrasonic signals until the desired sound level is obtained.

In the event that it is desired to reduce the sound level of the receiver 20, the transmitter 324 is operated to cause the volume-down resonator rod 376 to radiate a fourth ultra-sonic signal. This ultra-sonic signal is converted by the microphone 326 into an electrical signal which is fed into the amplifier network 328. The discriminator supplies a D.C. pulse to the conductor 333 connected to the grid of the negatively-biased tube 382, thereby to render the tube 382 conductive and complete an energizing circuit for the volume down relay 336, as follows: ground, control tube 382, conductor 386, relay winding 336er, and B-plus. The operation of the relay 336 causes its associated armature 406 to move downwardly, but since the rod 410 was previously lowered by the relay 334 and is retained in its lowered position by the over-center spring arrangement 412, the downwardly moving armature 406 does not actuate the rocker 386. However, if the rocker 386 was in its operative position (not shown), the armature 406 would coact with the rod 410 to acuate the rocker 386 into its FIG. l0 position. In any event, the downwardly moving armature 406 does perform a useful function since it closes a pair of contacts 440 to complete an energizing circuit for the motor control winding 468 of the motor 340, as follows: ground, contacts 440, conductor 442, contacts 444 controlled by a carn 453 mounted on the control shaft 392, conductor 446, conductor 448, contacts 449 controlled by the friction cam 450 on the motor shaft 340a, conductor 452, control winding 468, conductors 429, the A.C. source 430, and ground. The energization of the motor control winding 468 causes the motor shaft 340,11 simultaneously to rotate in a counterclockwise direction and move axially'upward into engagement with the input gear 405 of the gear train 390. Consequently, the pinion gear 339 rotates in a counterclockwise direction to effect a clockwise rotation of the control shaft 392, thereby to move the potentiometer shaft 49 toward the lower end of its range. At the end of the transmission of the fourth ultra-sonic signal, the relay 336 is deenergized, with the result that the contacts 440 are opened and the energizing circuit for the motor control winding 468 is likewise opened. Thus, the pinion gear 339 moves downwardly out of driving engagement with the input gear 405. With the driving connection broken, the movement of the potentiometer shaft 49 is arrested. As described above, the sound level of the receiver 20 is incrementally described and if the sound level obtained isl not low enough, successive fourth ultra-sonic signals are transmitted to incrementally decrease the sound levely until a desired volume is obtained.

In order to protect the volume potentiometer, which is adjustable over a range of approximately 320 and not throughout a range of 360, the position limit switches 424 and 444 are connected in the energizing circuits for the motor control windings 462 and 468v to automatically open-circuit the motor 38 when the potentiometer shaft 49 reaches the respective ends of its range. To this end, the cams 451 and 453 are so located on the control shaft 492 that the contacts 424 and 444 are opened incident to movement of the potentiometer shaft 49 into the respective ends of its range.

For example, if the potentiometer shaft 49 reaches the 

1. A CONTROL SYSTEM OPERABLE BY ENERGY SIGNALS RADIATED FROM A REMOTELY POSITIONED TRANSMITTER MEANS FOR CONTROLLING AN ELECTRICAL CIRCUIT MEANS INCLUDING A PLURALITY OF ADJUSTABLE ELEMENTS ASSOCIATED RESPECTIVELY WITH A PLURALITY OF CONTROL FUNCTIONS EACH HAVING A PLURALITY OF OPERATIVE CONDITIONS, MEANS RESPONSIVE TO FIRST ENERGY SIGNALS FOR SEQUENTIALLY ESTABLISHING DRIVING CONNECTIONS TO SELECTED ONES OF SAID ADJUSTABLE ELEMENTS AND PRIME MOVER MEANS OPERABLE IN RESPONSE TO SECOND ENERGY SIGNALS FOR DRIVING SELECTED ONES OF SAID ADJUSTABLE ELEMENTS THROUGH SAID DRIVING CONNECTIONS FOR PREDETERMINED PERIODS OF TIME TO INCREMENTALLY CHANGE THE OPERATIVE CONDITION OF THE CONTROL FUNCTIONS IN A FIRST PREDETERMINED MANNER AND FURTHER OPERABLE IN RESPONSE TO THIRD ENERGY SIGNALS FOR DRIVING SELECTED ONES OF SAID ADJUSTABLE ELEMENTS THROUGH SAID DRIVING CONNECTIONS FOR PREDETERMINED PERIODS OF TIME TO INCREMENTALLY CHANGE THE OPERATIVE CONDITION OF THE CONTROL FUNCTIONS IN A SECOND PREDETERMINED MANNER. 